System and method for forming oil mist in machining apparatus

Abstract

A system for forming an oil mist for lubrication machining includes a cooled oil storage device configured to store and maintain an oil for lubrication and cooling at a preset temperature, an oil supply line which is connected to the cooled oil storage device and heat-insulated and configured to supply oil from the cooled oil storage device, an indirect cooling device configured to form an indirect cooling air of a first temperature equal to or less than the preset temperature, and to indirectly cool the oil supply line to the first temperature, an oil nozzle configured to form the oil mist by injecting the oil of the first temperature supplied from the cooled oil storage device through the oil supply line, and a direct cooling device configured to form a direct cooling air of a second temperature lower than the first temperature, and to mix and inject the oil mist and the direct cooling air.

What is claimed is: 
     
         1 . A system for forming an oil mist for lubrication machining in a machining apparatus, the system comprising:
 a cooled oil storage device configured to store and maintain an oil for lubrication and cooling at a preset temperature;   an oil supply line which is connected to the cooled oil storage device and heat-insulated and configured to supply the oil from the cooled oil storage device therethrough;   an indirect cooling device configured to form an indirect cooling air of a first temperature equal to or less than the preset temperature, and to indirectly cool the oil supply line to the first temperature;   an oil nozzle configured to form the oil mist by injecting the oil of the first temperature supplied from the cooled oil storage device through the oil supply line; and   a direct cooling device configured to form a direct cooling air of a second temperature lower than the first temperature, and to mix and inject the oil mist and the direct cooling air.   
     
     
         2 . The system of  claim 1 , wherein the cooled oil storage device includes:
 an oil chiller configured to maintain the oil for lubrication and cooling at the preset temperature; and   an oil reservoir configured to, for a predetermined time period, store the oil supplied from the oil chiller and supply the stored oil to the oil supply line.   
     
     
         3 . The system of  claim 2 , wherein the oil reservoir includes:
 an oil supply pump configured to supply the oil stored in the oil reservoir to the oil supply line; and   an oil pressure regulator configured to maintain an output pressure of the oil supply pump at a predetermined pressure.   
     
     
         4 . The system of  claim 1 , wherein the indirect cooling device includes:
 at least one indirect cooling line configured to at least partially surround the oil supply line; and   at least one indirect cooling air supply device configured to form the indirect cooling air of the first temperature and supply the indirect cooling air to the at least one indirect cooling line.   
     
     
         5 . The system of  claim 4 , wherein the at least one indirect cooling air supply device includes:
 an indirect cooling compressor configured to compress and supply air; and   at least one indirect cooling vortex tube configured to form the indirect cooling air from the air supplied from the indirect cooling compressor and to supply the indirect cooling air to the at least one indirect cooling line.   
     
     
         6 . The system of  claim 5 , wherein a cooled air outlet of the at least one indirect cooling vortex tube is surrounded by a heat insulation material. 
     
     
         7 . The system of  claim 5 ,
 wherein the at least one indirect cooling line includes:
 a first indirect cooling line configured to at least partially surround the oil supply line; and 
 a second indirect cooling line configured to at least partially surround the oil supply line, at a downstream side of the first indirect cooling line, and wherein the at least one indirect cooling vortex tube includes: 
 a first indirect cooling vortex tube configured to form a first indirect cooling air from the air supplied from the indirect cooling compressor and to supply the first indirect cooling air to the first indirect cooling line; and 
 a second indirect cooling vortex tube configured to form a second indirect cooling air from the air supplied from the indirect cooling compressor and to supply the second indirect cooling air to the second indirect cooling line, and 
   wherein the oil supply line is provided to penetrate the first indirect cooling line and the second indirect cooling line to be connected from the cooled oil storage device to the oil nozzle.   
     
     
         8 . The system of  claim 7 , further including an indirect cooling air regulator disposed between the indirect cooling compressor and the at least one indirect cooling line, and configured to control a supply pressure of the indirect cooling air. 
     
     
         9 . The system of  claim 7 , wherein a dry air supply line configured to supply a dry air from a drying device is provided to penetrate the first indirect cooling line and the second indirect cooling line to be connected from the drying device to a direct cooling air supply device. 
     
     
         10 . The system of  claim 9 , wherein the direct cooling air supply device includes a direct cooling vortex tube configured to form the direct cooling air from the dry air supplied from the dry air supply line and to supply the direct cooling air to a mixture injection device. 
     
     
         11 . The system of  claim 4 , wherein the direct cooling device includes:
 a direct cooling compressor configured to compress and supply air;   a drying device configured to form a dry air by removing moisture from the air supplied from the direct cooling compressor;   a dry air supply line configured to supply the dry air from the drying device;   a direct cooling air supply device configured to form the direct cooling air of the second temperature by use of the dry air from the dry air supply line; and   a mixture injection device configured to inject the direct cooling air from the direct cooling air supply device to be mixed with the oil mist.   
     
     
         12 . The system of  claim 11 , wherein the dry air supply line is provided to penetrate the at least one indirect cooling line to be connected from the drying device to the direct cooling air supply device. 
     
     
         13 . The system of  claim 12 , wherein the direct cooling air supply device includes a direct cooling vortex tube configured to form the direct cooling air from the dry air supplied from the dry air supply line and to supply the direct cooling air to the mixture injection device. 
     
     
         14 . The system of  claim 11 , wherein the drying device includes:
 an air dryer configured to remove moisture from the air supplied from the direct cooling compressor;   a water filter configured to filter water from the air supplied from the direct cooling compressor; and   a direct cooling air regulator configured to adjust a supply pressure of the direct cooling air,   wherein the air supplied from the direct cooling compressor is converted to the dry air by passing through the air dryer, the water filter, and the direct cooling air regulator.   
     
     
         15 . The system of  claim 14 , wherein the air dryer includes:
 a primary heat-exchanger configured to primarily cool a compressed air while moving the compressed air in a horizontal direction and downward; and   a secondary heat-exchanger configured to perform cooling by a plurality of cross fins disposed below the primary heat-exchanger and formed perpendicular to a refrigerant line and to remove the moisture by condensing and discharging,   wherein the compressed air is primarily cooled in the primary heat-exchanger through heat exchange with air from which the moisture has been removed in the secondary heat exchanger.   
     
     
         16 . The system of  claim 14 , wherein the direct cooling air regulator includes a water separator configured to additionally remove remaining moisture. 
     
     
         17 . The system of  claim 11 , wherein a nozzle area of the mixture injection device is surrounded by a heat insulation material. 
     
     
         18 . The system of  claim 1 , wherein the oil nozzle is configured to form the oil mist by use of the oil of the first temperature supplied through the oil supply line. 
     
     
         19 . A method for forming oil mist in a machining apparatus, the method comprising:
 extracting an oil cooled to a preset temperature from a cooled oil storage device;   maintaining and supplying the oil below the preset temperature by supplying the extracted oil through an oil supply line configured to penetrate at least one indirect cooling line cooled to a first temperature equal to or less than the preset temperature;   forming a direct cooling air of a second temperature lower than the first temperature; and   forming the oil mist of the oil and injecting the direct cooling air to be mixed with the oil mist.   
     
     
         20 . The method of  claim 19 , wherein the forming of the direct cooling air includes:
 compressing air;   removing moisture from the compressed air to form a dry air;   primarily cooling the dry air by flowing the dry air through a dry air supply line penetrating the at least one indirect cooling line; and   additionally cooling the primarily cooled air through a direct cooling vortex tube.